3/4'' PEX TUBING 100' - O2 Oxygen Barrier Radiant Heating Systems -PEX DIRECT Water Application (North America Certification) CSA 137.5 (Canadian Certification) Warnock Hersey Canada (Canadian Certification) DIN 4726 (European Standard)Pressure ratings: 79psi @ 200F, 100psi @ 180F, 160psi @ 73F by PPI